Kinetics

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Renee Grange 1I
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Kinetics

Postby Renee Grange 1I » Mon Mar 16, 2020 1:24 am

What is the difference between kinetically and thermodynamically controlled?

Tauhid Islam- 1H
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Joined: Fri Aug 02, 2019 12:15 am

Re: Kinetics

Postby Tauhid Islam- 1H » Mon Mar 16, 2020 6:45 am

From my understanding, a reaction is determined by either the thermodynamic properties of the products or the kinetic factors or the rate of product formation. When the temperate is low, there is only enough energy to get past a small activation energy barrier until the reaction proceeds to the right to form the products, on the other hand, when the temperature is high, the reactants can get past a higher activation energy barrier, therefore molecules that are more stable (less energy) can be formed. If a reaction is kinetically controlled, that means generally, the temperature is low so the reaction is not controlled by thermodynamic properties but by the kinetics or by the rate of products that can be formed. On the other hand, if a reaction is thermodynamically controlled, the reaction is controlled by the thermodynamic properties of the reaction, and that dictation generally happens at higher temperatures.

Bella Townsend
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Re: Kinetics

Postby Bella Townsend » Tue Mar 17, 2020 9:37 pm

In general short reactions favor kinetic control, while long reactions favor thermodynamic control.

Kandyce Lance 3E
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Re: Kinetics

Postby Kandyce Lance 3E » Sun Feb 21, 2021 10:02 pm

Bella Townsend wrote:In general short reactions favor kinetic control, while long reactions favor thermodynamic control.


This is really helpfull and straightforward thank you!!

alebenavides
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Re: Kinetics

Postby alebenavides » Mon Feb 22, 2021 3:58 pm

kinetic controlled is for short reations and thermodynamically is for long reactions

DMaya_2G
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Re: Kinetics

Postby DMaya_2G » Fri Feb 26, 2021 5:31 pm

Kinetic controlled is for short reactions. In contrast, thermodynamically is for long reactions.

Trevor_Ramsey_3H
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Re: Kinetics

Postby Trevor_Ramsey_3H » Fri Feb 26, 2021 5:35 pm

Can someone explain what kinetic controlled and thermodynamically controlled means?

Ximeng Guo 2K
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Joined: Wed Sep 30, 2020 9:54 pm

Re: Kinetics

Postby Ximeng Guo 2K » Sun Feb 28, 2021 4:35 am

I found this clarification on the internet:

Thermodynamics describes the overall properties, behavior, and equilibrium composition of a system; kinetics describes the rate at which a particular process will occur and the pathway by which it will occur.

So for thermodynamics we are interested in the start and end states in a reaction, while for kinetics we look at the exact path taken by the reaction?

Justin Nguyen 3E
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Joined: Wed Sep 30, 2020 9:35 pm

Re: Kinetics

Postby Justin Nguyen 3E » Sun Feb 28, 2021 10:51 am

I think that a kinetically controlled reaction is one where there the least activation energy is required to power it, whereas a thermodynamically controlled reaction is when the product is formed because it possesses the lowest free energy. The diagram (figure 14.3.1) on this site really helped me understand the difference

https://chem.libretexts.org/Courses/Ath ... _Reactions

Adam Bustamante 1I
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Re: Kinetics

Postby Adam Bustamante 1I » Sun Feb 28, 2021 6:39 pm

a shorter reaction is controlled by kinetics whereas thermodynamics control longer reactions, such as


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